determination of mercury using msis is it possible?

Hello good morning. I am trying to determine mercury by icp-oes, I am using an agilent multimode sample introduction system and my equipment is the icp-oes 5110. According to the equipment information, mercury can be analyzed by means of chloride tin or borohydride. According to the information the signals should be better with stannous chloride but I am not getting good intensity signals. I get a better signal with borohydride but it is not enough for my analysis. Could someone tell me why I don't get good signals with stannous chloride?

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